想請教Linux,安裝MRTG時發生些錯誤

OS:CentOS 5

執行到

cfgmaker --global 'WorkDir: /var/www/mrtg/web' \
--global 'Options[_]: growright' \
--output /etc/mrtg/mrtg.cfg \
public@192.168.1.19

出現以下的錯誤訊息..

想請教,這是怎麼了 ?? 感謝

Error:
can't resolve "Options[_]" to IP address
at /usr/bin/../lib/mrtg2/SNMP_util.pm line 426
SNMPWALK Problem for public@Options[_]: growright--output:::::v4only
at /usr/bin/cfgmaker line 918
WARNING: Skipping public@Options[_]: growright--output as no info could be retrieved

Error:
can't resolve "/etc/mrtg/mrtg.cfg" to IP address
at /usr/bin/../lib/mrtg2/SNMP_util.pm line 426
SNMPWALK Problem for public@/etc/mrtg/mrtg.cfg::::::v4only
at /usr/bin/cfgmaker line 918
WARNING: Skipping public@/etc/mrtg/mrtg.cfg: as no info could be retrieved